英文缩写分类（U 开头）

U U2 UA UAA UAAC UAB UAC UACL UADR UAE UAF UAG UAH UAI UAIDE UAL UAN UAP UAR UARFCN UARS UART UAS UAT UATI UAV UAW UAX UB UBA UBC UBCS UBD UBL UBM UBR UBS UBT UC UCA UCAS UCBC UCC UCCRL UCD UCHI UCI UCL UCLA UCLES UCMJ UCP UCS UCSD UCSF UD UDA UDACMB UDAG UDC UDDI UDES UDF UDI UDMA UDMH UDOT UDP UDR UDRP UDS UDT UDTS UDTV UE UEA UEFA UEI UEL UEM UESTC UET UETA UF UFA UFB UFD UFI UFJ UFN UFO UFP UFRD UFT UFV UG UGA UGC UGF UGS UGT UGW UH UHC UHCI UHF UHMPE UHMWPE UHT UHVI UI UIBC UIBE UIC UICC UID UIL UIN UIP UIPP UIR UIS UIT UITF UJ UK UKAS UKC UKCOSA UKFO UKPIA UKWAS UL ULCC ULD ULEV ULF ULL ULSI ULT ULVS UM UMA UMB UMBI UMD UMG UMHMRC UMI UMICH UMIST UML UMP UMS UMTS UN UNAIDS UNC UNCATD UNCDF UNCED UNCF UNCITRAL UNCTAD UNDELVD UNDP UNE UNECE UNEP UNESCO UNFCCC UNFF UNFPA UNFURN UNG UNHCR UNI UNICA UNICEF UNIDO UNIDROIT UNISA UNITAR UNIV UNIX UNKWN UNODC UNOG UNOV UNREVD UNSC UNSCOM UNSF UNSG UNSW UNSYM UNU UO UOD UOF UOFMELB UOM UOS UOSAT UOW UP UPA UPC UPDG UPENN UPF UPGG UPGM UPGR UPI UPL UPN UPNP UPR UPS UPT UPU UQ UR URA URB URC URC522 URE URG URI URL URMS URN URO URR525 URT URUMQI US USA USAC USACE USAF USAFI USAFR USAID USAR USAREUR USART USAT USB USBC USBDCDPD USBLS USBP USBR USBS USBTA USC USCA USCG USCGR USCRC USCS USCSC USD USDA USDEA USDHEW USDHUD USDI USDJ USDL USDM USDT USEL USEPA USERC USES USFDA USFL USFWS USG USGS USH USIA USINS USIS USIT USITC USL USM USMA USMC USMCR USN USNA USNG USNO USNR USO USOS USP USPHS USPO USQ USR USS USSB USSR USSSA USST USTA USTB USTC USTR USU USW USWC USWV USYD USYS UT UTA UTAS UTC UTCS UTL UTM UTOC UTP UTR UTS UU UUCP UUE UUID UULT UUS UUT UV UVA UVB UVC UVD UVR UVS UVVIS UW UWA UWB UWC UWHF UWS UX UXGA UY UZ UZB